• konfiguruje se na portech s telefony
• trunk se vyjedná s telefonem díky DTP a CDP

Switch(config-if)# switchport voice vlan {vlan-id | dot1p | untagged | none}

Switch# show interfaces type mod/num switchport
Switch# show running-config interface type mod/num

Switch# show running-config interface fastethernet 1/0/1
interface FastEthernet1/0/1
   switchport trunk native vlan 99
   switchport access vlan 10
   switchport voice vlan 110

Switch# show spanning-tree interface type mod/num

Switch# show spanning-tree interface fastethernet 1/0/1
Vlan		 Role Sts Cost		Prio.Nbr   Type
---------------- ---- --- ---------     --------   ----------------------------
VLAN0010 	 Desg FWD 19 		128.51	   P2p
VLAN0110 	 Desg FWD 19 		128.51     P2p